/*
 * Copyright 2018 Confluent Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.confluent.kafka.schemaregistry;

import java.util.List;

/**
 * An interface for validating the compatibility of a single schema against
 * another.
 *
 * <p>What makes one schema compatible with another is not defined by the contract.
 * </p>
 */
public interface SchemaValidationStrategy {

  /**
   * Validates that one schema is compatible with another.
   *
   * @param policy The compatibility policy to use for validation
   * @param toValidate The schema to validate
   * @param existing The schema to validate against
   * @return List of error message, otherwise empty list
   */
  List<String> validate(CompatibilityPolicy policy, ParsedSchema toValidate, ParsedSchema existing);
}
